Answer
The answer is "none". Bai Ling did not have a cameo in any Marvel film. The actress has starred in numerous movies and TV shows throughout her career, but none of them were Marvel productions. She gained prominence for her portrayal of Jenny Wah in "Red Corner" (1997) and starred in diverse films such as "Wild Wild West" (1999), "Anna and the King" (1999), and "The Crow" (1994).